How do I administer NovoMix 30 (insulin aspart protamine suspension) subcutaneously?

How to Use NovoMix 30 FlexPen

Inject NovoMix 30 subcutaneously using a 4-mm pen needle at a 90° angle immediately before breakfast and dinner, after gently rolling the pen 10 times and tipping it up and down 10 times to resuspend the cloudy insulin. 1, 2

Pre-Injection Preparation

Insulin Resuspension (Critical for NovoMix 30)

• Gently roll the pen horizontally between your palms 10 times, then tip it up and down 10 times until all white crystals are fully dissolved and the insulin appears uniformly cloudy 1
• Never shake the pen vigorously, as this creates air bubbles that affect dose accuracy 3
• The insulin should look uniformly white and cloudy after mixing; do not use if it remains clear or has clumps 2

Temperature and Storage

• Remove the pen from the refrigerator 30–60 minutes before injection to allow it to reach room temperature, which reduces pain and prevents lipodystrophy 3, 1
• Store unopened pens in the refrigerator at 36°F to 46°F (2°C to 8°C) until the expiration date 2
• Once opened, store at room temperature below 86°F (30°C) and discard after 14 days, even if insulin remains 2

Hand Hygiene and Site Inspection

• Wash your hands thoroughly before handling the pen 1
• Visually inspect the injection site for redness, swelling, lumps, or wounds—never inject into abnormal areas 1

Needle Attachment and Priming

• Attach a new 4-mm pen needle before every injection—never reuse needles, as they lose sterility and become damaged 1, 4
• Prime the pen by dialing 2 units and pressing the button until at least one drop of insulin appears at the needle tip to verify free flow and ensure accurate dosing 1, 4
• Remove the needle immediately after each injection and never leave it attached to the pen, as this causes air contamination and medication leakage 1, 2

Injection Site Selection

Recommended Body Areas

• Inject into the abdomen (fastest absorption), thighs (upper third anterior lateral aspect), buttocks (posterior lateral aspect), or upper arms (middle third posterior aspect) 1, 5
• Stay at least 2 fingerbreadths (approximately 1 cm) away from the umbilicus when injecting in the abdomen 1
• The arm is the least preferred site for self-injection because it is difficult to maintain the proper 90° angle without assistance 3

Site Rotation Strategy

• Divide each injection area into quadrants or halves and rotate systematically within one area before moving to another, using one zone quadrant/half per week 1, 5
• Inject at least 1 cm (one finger-width) from the previous injection site, rotating in a consistent direction 3, 1
• Systematic rotation prevents lipohypertrophy (lumpy tissue), which causes unpredictable insulin absorption and poor glucose control 1, 5

Injection Technique

Needle Insertion

• Hold the pen perpendicular to the skin at a 90° angle 1
• Insert the 4-mm needle fully in one smooth motion 1
• For very thin adults, young children (≤6 years), or pregnant individuals, gently lift a skin-fold without blanching before insertion to ensure subcutaneous delivery 1

Dose Delivery

• Do not press the thumb button until the needle is fully inserted into the skin 1, 4
• Press the thumb button straight down along the pen's axis (not at an angle), injecting slowly and steadily 1
• After the button is fully depressed, count slowly to 10 while maintaining pressure on the button and keeping the needle embedded in the skin to ensure complete dose delivery 1, 4

Needle Removal and Disposal

• Withdraw the needle straight out without pressing the skin 1
• Discard the needle immediately in a puncture-resistant sharps container without recapping 1, 2
• Never share pens or needles between patients, as this transmits blood-borne infections 1, 2

Post-Injection Care

• If a small amount of blood or fluid appears, blot gently with gauze—do not rub or apply pressure 1
• Do not apply bandages or pressure to the injection site 1
• Occasional bruising does not affect insulin absorption 1
• Avoid touching, scratching, or applying lotions for several hours; gentle washing with soap and water after 1 hour is permissible 1

Storage and Maintenance

• Store the pen without the needle attached to prevent leaking, needle blockage, and air entry 2
• Never freeze NovoMix 30; discard if it has been frozen 2
• Keep the pen away from heat and direct sunlight 3, 2
• Clean the outside of the pen by wiping with a damp cloth—do not soak or wash it 2
• Discard the pen after 14 days of use at room temperature, even if insulin remains 2

Critical Safety Pitfalls to Avoid

• Never inject into areas with lipohypertrophy (lumps or firm tissue), as this causes slower and unpredictable absorption 1, 5
• Never inject through clothing 3
• Never reuse needles—they lose sterility and may become bent or hooked, causing tissue damage 1, 4
• Never leave needles attached between injections, as this distorts dose accuracy 4, 2
• Intramuscular injection causes unpredictable, faster insulin absorption leading to unexpected hypoglycemia—always use 4-mm needles at 90° to ensure subcutaneous delivery 1
• Have all injection sites inspected by your healthcare provider at every visit, or at least annually 5